domain

Noun

• the content of a particular field of knowledge

• people in general; especially a distinctive group of people with some shared interest
  • the Western world
    

• (mathematics) the set of values of the independent variable for which a function is defined

• territory over which rule or control is exercised
  • his domain extended into Europe
    
  • he made it the law of the land
    

• a particular environment or walk of life
  • his social sphere is limited
    
  • it was a closed area of employment
    
  • he's out of my orbit
    

Related words

• Synonyms: 
  knowledge domain , knowledge base , world , domain of a function , demesne , land , sphere , area , orbit , field , arena